Grate



(No Model.)

G. B. MERSHON.

GRATE.

No. 393,999. Patented Dec. 4, 1888..

.hzrantnr- N. PEYERS, PhOfD-Lifiwgnphor Waslungtnn D C.

UNITED STATES PATENT OFFICE.

GEORGE E. )IERSIION, ()F PHILADELPHIA, PENNSYLVANIA.

GRATE.

SPECIFICATION forming part of Letters Patent No. 393,999, dated December 4, 1888.

Application filed June 4, 1887. Serial No. 240,334. (No model.)

To coZZ whom it may concern.-

Be it known that I, GEORGE B. MERSHON, a citizen of the United States, anda resident of the city and county of Philadelphia, and State of Pennsylvania, have invented certain new and usefulImprovements in Grates, of which the following is a specification.

Heretot'ore the bottom bars of furnaces, stoves, ranges, &c., have frequently been made hollow and have had passed through them currents of water for the double purpose of preventing the grate-bars becoming overheated and burning out and heating the water. The fire-box of stoves and ranges have also frequently been provided with hollow metallic backs, through which water passing became heated. All such earlier constructions of devices I disclaim as forming no part of my present invention.

In stoves and ranges wherein an openfront grate is employed the most intense heat is experienced at the fire-level along the up per portion or directly above such front grate, owing to the copious quantity of oxygen there supplied, which by the time it reaches the upper part of the grate has become so heated as to support a very intense combustion, and, further, owing to the fact that this part of the grate rarely becomes clogged with ashes, which fall or sift down to the lower part of the firebox, and it is a common experience that this upper portion of the front grate is the first to burn out. In order to utilize the intense heat of this portion of the fire, as well as to prevent the rapid destruction of the grate, I place a water-heater at about the firelevel and directly over the upper part of the front grate, utilizing the upper part thereof as the water back or heater.

Figure 1 is a perspective view of myinvention. Fig. 2 is a cross-section of a stove havin g the invention applied thereto.

In the drawings, A A represent the front grate-bars, and A A the bottom gratebars. These may be of any desired shape or construction and either solid or hollow and adapted to have water circulate through them, and may be supported in the stove E in any desired way.

In Fig. l. the upper part of the front grate is shown as consisting of an enlarged hollow chamber, 15, into which water may be passed through pipe whence, after becoming heat ed, it is conducted away through exit-pipe L". The wa tei passagc through chamber B may be direct and large, or it may be contracted and tortuous, either construction permitting the heat to effectively act upon the water. The pipes (I C may pass through the stovewalls at any desired points, and if found desirable may be made to circulate (more or less) in the fire-box, either before or after reaching the water-heater. Should the bars A be hollow, they may communicate with this chamber, and thus the whole grate be kept from overheating. Even though the gratebars be not hollow, the presence of water in the heater or chamber B prevents the upper portion of the grate from becoming overheated and burning out by conducting away the heat therefrom, as will be readily understood without further description.

It will be seen that the water-heating chamber is thicker than are the gratebars from front to rear, and that it takes the place of a fire-brick between the front wall, e, of the stove and the fire-box. The front of the stove is provided either with doors, dampers, or other means, whereby the air may enter between the grate-bars and pass thence up on the inside of the water-heater, where a vig0r ous combustion is kept up, the air being heated as it passes between the hot grate-bars A and the burning fuel in proximity thereto.

hat I claim is- In combination with a stove, a water-chamber, B, and front grate in one piece, and circulating water-connections communicating with the chamber, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE E. MERSHQN.

Vitnesses:

GEo. W. REED, N. 0. LANE. 

